xfce4-panel crashed with SIGABRT in g_assertion_message()

I got this crash report at startup

ProblemType: Crash
DistroRelease: Ubuntu 24.04
Package: xfce4-panel 4.18.4-1build2
ProcVersionSignature: Ubuntu 6.8.0-51.52-generic 6.8.12
Uname: Linux 6.8.0-51-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Sun Jan 19 19:31:55 2025
ExecutablePath: /usr/bin/xfce4-panel
ExecutableTimestamp: 1711874062
InstallationDate: Installed on 2025-01-19 (1 days ago)
InstallationMedia: Xubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827)
JournalErrors: -- No entries --
ProcCmdline: xfce4-panel
ProcCwd: /home/davide
ProcEnviron:
 LANG=it_IT.UTF-8
 LANGUAGE=en
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
Signal: 6
SignalName: SIGABRT
SourcePackage: xfce4-panel
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_assertion_message_expr () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_object_unref () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: xfce4-panel crashed with SIGABRT in g_assertion_message_expr()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sudo users
separator:
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ProblemType: Bug
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
DistroRelease: Ubuntu 24.04
InstallationDate: Installed on 2025-01-19 (1 days ago)
InstallationMedia: Xubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827)
Package: xfce4-panel 4.18.4-1build2
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 6.8.0-51.52-generic 6.8.12
Tags: noble
Uname: Linux 6.8.0-51-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sudo users
_MarkForUpload: True
mtime.conffile..etc.apport.crashdb.conf: 2025-01-20T14:31:19.750481